行列换位法采用密钥，假设密钥是5，明文是I am a Chinese boy那么就会以5位列数排成一个矩阵。 I a m a c

h I n e s

e b o y 那么密文就是ihe aib mno aey cs× ，最后一行不足的用随机字母填充，（×代表那个随机字母）！-The ranks of the use of key transposition law, assuming that key is 5, is clearly I am a Chinese boy then ranked number 5 in a matrix line. Well, I amach I neseboy ciphertext is ihe aib mno aey cs ×, the last line of under-filled with random letters, (× random letters on behalf of that)!